I tried it on my XDAIIi but the buttons don't work, like nothing is selectable. you tap on the screen with the stylus and nothing happens. The exit button (grey one) works.
It would be good if it worked well on the XDAIIi as you could run SJphone (sip Phone client)in the background and switch between the two. With the Win CE orbiter when the phone rings the orbiter closes and you have to re start it.
does the M003 have a microphone or mic socket? I would be interested to see if the sipdroid 'app' could be setup, a 'Generic SIP Phone' added to LMCE and the unit used as a phone as well as an orbiter